JP2011079061A - Die tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a die tool by which air jetting holes can be easily machined. <P>SOLUTION: The die tool 1 includes a discharge hole 7 with a diameter larger than that of a die hole 3 in a die body 5 having the die hole 3 on the upper part and a drill tool engaging portion 27 arranged on the inner peripheral surface of the die body 5 and the lower side from an intermediate height position of the die body 5. In the die tool, a plurality of air jetting holes 13 for jetting air while being directed in the lower direction of the discharge hole 7 are obliquely formed on the drill tool engaging portion 27 and the inlets of the air jetting holes 13 are formed upper than the intermediate height of the discharge hole 5, wherein an angle formed by the axial center of the die body 5 and each of the air jetting holes 13 is an acute angle of ≤45°. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a die tool used when punching a plate-like workpiece, and more particularly, to a die tool that can effectively discharge a scrap generated by punching a workpiece.

  A die tool used for a punch press for punching a plate-like workpiece generally has a configuration in which a discharge hole having a diameter larger than that of the die hole is provided in a cylindrical die body having a die hole at an upper portion. is there. When punching a plate-shaped workpiece by a punch press such as a turret punch press, the workpiece is positioned on the upper surface of the die tool, and the punch that cooperates with the die tool is punched by a vertically movable striker (ram). The workpiece is punched by engaging the lower end of the punch with the die hole of the die tool.

  When the workpiece is punched as described above, when the punch returns upward, the punched residue may adhere to the lower surface of the punch and float on the upper surface of the workpiece. Punching may be performed in a state where the workpiece and the workpiece overlap, and the punch may be damaged.

  Therefore, a plurality of air ejection holes directed obliquely downward are provided in the die tool body, and air is ejected from the air ejection holes into the die tool to discharge punching waste (for example, Patent Documents 1 and 2). reference).

Japanese Patent No. 3245935 JP-A-5-57687

  In the configurations described in Patent Documents 1 and 2, the inclined air ejection hole extending from the peripheral surface of the cylindrical die tool to the discharge hole is the outer peripheral surface of the die tool and extends along the axis of the die tool. When expressed by a cut end view, machining is performed from a portion represented by a straight line parallel to the axis of the die tool. Therefore, conventionally, there is a problem that the processing of the air ejection holes is troublesome and has an expensive configuration. Further, when the air ejection hole is deep hole machining, a thin and long drill is required, and there is a problem that the drill tip easily escapes from the machining position at the start of machining of the air ejection hole, and the drill is bent and easily broken.

  In addition, since it is difficult to process the air ejection hole, it is difficult to reduce the angle formed by the axis of the die tool and the air ejection port. It is desired.

  The present invention has been made in view of the problems as described above, and is a die tool having a discharge hole larger in diameter than the die hole in a die body having a die hole in an upper portion thereof, A peripheral surface is provided below the intermediate height position of the die main body with a drilling tool locking portion, and air is jetted to the drilling tool locking portion in the downward direction of the discharge hole. A plurality of air ejection holes are formed obliquely and an inlet of the air ejection hole is formed above an intermediate height position of the discharge hole, and the axis of the die body and the axis of each of the air ejection holes Is an acute angle of 45 ° or less.

  According to the present invention as described above, the air ejection hole inclined with respect to the die body in the die tool can be easily machined at an acute angle with respect to the axis of the die body. The conventional problem can be solved.

It is explanatory drawing of the die tool which concerns on the 1st reference example of this invention. It is explanatory drawing of the die tool which concerns on the 2nd reference example of this invention. It is explanatory drawing of the die tool which concerns on the 3rd reference example of this invention. It is explanatory drawing of an outer piece. It is explanatory drawing of the die tool which concerns on embodiment of this invention. It is explanatory drawing of the die tool which concerns on another embodiment of this invention. It is explanatory drawing of the die tool which concerns on another embodiment of this invention. It is sectional explanatory drawing which shows the change form of an air ejection hole.

  Referring to FIG. 1, a die tool 1 according to a first reference example of the present invention includes a die holder such as a lower turret in a turret punch press or a die holder 2 detachably mounted on a lower turret. It is used by being mounted in the mounting hole 2H. This die tool 1 has a configuration in which a discharge hole 7 having a diameter larger than that of the die hole 3 is provided in a cylindrical die body 5 having a die hole 3 at the upper portion, On the upper side, when the air ejection hole 13 is machined, there is formed a drilling tool locking part that locks the tip of the drilling tool for machining the air ejection hole 13 so that it does not slip.

  That is, as an example of the drilling tool locking portion, in this example, an inclined surface 9 is formed on the outer peripheral surface of the die body 5 so that the axial center side of the die body 5 becomes higher. As a configuration for forming the inclined surface 9, in FIG. 1, the circumferential groove 11 having a circular arc shape (C shape) is illustrated as an example. However, the circumferential groove 11 may have a configuration in which the cross-sectional shape is V-shaped. The circumferential groove 11 may be formed on a part or the entire circumference of the outer peripheral surface of the die body 5.

  The inclined surface 9 is provided with inlets of a plurality of air ejection holes 13 formed in order to eject air in the downward direction of the discharge hole 7 at equal intervals in the circumferential direction. . The axis of the air ejection hole 13 is preferably configured to be orthogonal to the inclined surface 9. More precisely, since the inclined surface 9 is exemplified by a curved surface having an arc shape in cross section, the tangent at the intersection of the axial center of the air ejection hole 13 and the curved surface having an arc shape in cross section and the air ejection It is desirable that the axial center of the hole 13 is orthogonal. However, the tangent line and the axis need not necessarily be orthogonal to each other, and may be inclined to some extent within an allowable range.

  As already understood, the air ejection holes 13 are drilled so as to be inclined with respect to the axis 5S of the die body 5 at the inclined surface 9 as the drilling tool locking portion. The component force generated at the tip of the drill is small when thrust is applied to the drill, and the tip of the drill is inclined even when a thin and long drill is used as the drilling tool for drilling. It becomes a mode in which the surface 9 is locked without slipping, and the drill tip can be prevented from escaping from the machining position due to the component force acting on the drill tip during drilling, which breaks a drilling tool such as a drill. The air ejection holes 13 can be easily processed without any problems.

  Further, as the circumferential groove, a groove having a U-shaped cross section can be used. In this case, it is not necessary to provide the groove over the entire circumference of the outer peripheral surface of the die body 5, and it is sufficient to provide the groove only in a necessary portion. However, the groove may be provided over the entire circumference. The grooves as described above can be formed by cutting a part of the outer peripheral surface of the die body 5 with, for example, a milling tool.

  In the configuration in which the groove having the U-shaped cross section is formed on the outer peripheral surface of the die body 5 as described above, the drilling process is performed by positioning the tip of a drilling tool such as a drill at the corner where the plane intersects. As a result, the tip of the drill is locked without any slippage due to the component force acting on the tip, and the air ejection hole 13 inclined in the die body 5 can be easily processed.

  In addition, when processing the air ejection hole 13, as a drilling tool, it is not restricted to cutting tools, such as a drill, For example, the air ejection hole 13 can be processed also by performing electrical discharge machining using a thin pipe material as an electrode. In this case, the electrode serves as a drilling tool.

  The outlet 13A of the air ejection hole 13, that is, the opening 13A into the discharge hole 7 is formed below the intermediate height position of the die body 5, and the cross-sectional area of each air ejection hole 13 is It is formed smaller than the cross-sectional area of the air supply path around the die body 5. In the present example, the air supply path is exemplified by the circumferential groove 11 connected to a connection path connected to an air source (not shown).

  Therefore, the high-pressure air from the air source is supplied to the circumferential groove 11 through the connection path, and is directed downward from the circumferential groove 11 through the air ejection holes 13 into the discharge hole 7. Is injected.

  As already understood, according to the above configuration, the drilling tool locking portion (a part of the circumferential groove 11) formed on the outer peripheral surface of the die body 5 prevents the drilling tool from slipping. Since the drilling process is performed, the angle θ formed by the axis 5S of the die body 5 and the axis 13S of the air ejection hole 13 can be processed to an acute angle of about 45 ° or less.

  Therefore, if the air is directed downward from the air ejection hole 13 having a smaller cross-sectional area than the air supply path toward the inside of the discharge hole 7, the directivity in the downward direction is large and the air is ejected. The action of sucking outside air from the die hole 3 is increased due to the high speed and the both, and the suction and discharge of the punched waste of the workpiece (not shown) punched in cooperation with the punch (not shown) is performed. It can be performed more effectively.

  By the way, in the said structure, it is set as the structure which provides the several connection path connected to the said die attachment hole 2H in the die holder 2, and connects each said connection path directly to each air ejection hole 13 provided in the die main body 5. FIG. It is also possible. However, in consideration of ease of processing, a configuration in which the peripheral groove 11 is provided on the outer peripheral surface of the die body 5 or a configuration in which a peripheral groove corresponding to the air ejection hole 13 is provided on the inner peripheral surface of the die mounting hole 2H is adopted. Is desirable.

  In this case, when the peripheral groove 11 is provided over the entire outer periphery of the die body 5 or when a peripheral groove is provided over the entire inner peripheral surface of the die mounting hole 2H, the peripheral groove 11 is provided in the die body 5. The total cross-sectional area of the plurality of air ejection holes 13 is preferably smaller than the cross-sectional area of the circumferential groove.

  FIG. 2 shows a second reference example of the present invention, and components having the same functions as those described above are denoted by the same reference numerals, and redundant description is omitted. In the second reference example, the drilling tool locking portion is formed by counterboring a plurality of locations on the outer peripheral surface of the die body 5 with a rotary cutting tool such as an end mill. That is, the inclined surface 17 corresponding to the inclined surface 9 is formed at the bottom portion of the counterbore processing portion 15.

  In the above configuration, when the counterbored portion 15 is machined on the outer peripheral surface of the die body 5 in a state where the axis of a milling tool such as an end mill is appropriately inclined with respect to the axis of the die body 5, the inclined surface Reference numeral 17 denotes a flat surface. Therefore, the air ejection hole 13 can be machined so as to be orthogonal to the inclined surface 17, and even a thin and long drill does not cause a slip due to a component force at the tip, and can be easily broken. Can be perforated. That is, drilling can be performed in a form in which the tip of a drill as a drilling tool is locked without causing slippage.

  FIG. 3 shows a third reference example according to the present invention, and the same reference numerals are given to components having the same functions as those described above, and redundant description is omitted. In the third reference example, vertically long through holes 19 are formed at a plurality of locations of the die body 5 in the die tool 1, and the air ejection holes 21 are obliquely formed in advance in the through holes 19 as shown in FIG. This is a configuration in which a processed rubber or resin outer piece 23 is fitted.

  According to the above configuration, since the resin outer piece 23 provided with the air ejection holes 21 in advance is fitted and fixed to the through holes 19 formed in the die body 5, the die tool provided with the air ejection holes 21. 1 can be easily manufactured.

  When the outer piece 23 is made of a resin that is relatively soft and easy to process, the air ejection hole 21 is punched after the outer piece 23 is fitted and fixed in the through hole 19 of the die body 5. Is also possible.

  FIG. 5 shows an embodiment according to the present invention, and components having the same functions as those described above are denoted by the same reference numerals, and redundant description is omitted. In this embodiment, the case where a drilling tool locking part is provided on the inner peripheral surface of the discharge hole 7 in the die body 5 is illustrated. FIG. 5A shows the peripheral groove 11 as the drilling tool locking part. 5 shows a case where the inner circumferential groove 25 corresponding to is formed, and the air ejection hole 13 is machined into the circumferential groove 25 from the inside, and FIG. 5B shows air on a tapered surface 27 formed as a drilling tool locking portion. The case where the ejection hole 13 is processed from the inside is illustrated. In FIG. 5C, a counterbore processing portion 29 similar to the counterbore processing portion 15 is formed on the inner peripheral surface of the die body 5 as a drilling tool locking portion, and the air ejection hole 13 is formed in the counterbore processing portion 29. The case where it processes from the inside is illustrated.

  Even in the above-described configuration, the air ejection hole 13 can be easily machined in the same manner as described above without causing a component force that breaks the drilling tool when the air ejection hole 13 is drilled.

  FIG. 6 shows another embodiment according to the present invention, and the same reference numerals are given to components having the same functions as those described above, and redundant description is omitted. In this embodiment, the die body 31 having the die hole 3 is provided in the die body 5, and the air ejection holes 13 are formed at positions that do not interfere with the die chip 31.

  FIG. 6 (A) processes the air ejection hole 13 from the inside on the inner tapered surface 27 as the drilling tool locking portion, and FIG. 6 (B) shows the step portion (inside circumferential groove as the drilling tool locking portion ( The case where the air ejection hole 13 is processed in the corner portion 33 from the inside is illustrated.

  Even in the above configuration, the air ejection hole 13 can be easily machined without breaking the drilling tool due to the component force when the air ejection hole 13 is machined. Moreover, even if it is the structure provided with the die chip 31, the air ejection hole 13 can be processed without any problem.

  FIG. 7 shows still another embodiment according to the present invention, and shows a modification of the embodiment shown in FIG. In this embodiment, the air ejection hole 13 is connected to a communication hole 35 formed from the outer peripheral surface of the die body 5.

  According to the above-described configuration, the diameter of the communication hole 35 can be made larger than the diameter of the air ejection hole 13, the length of the air ejection hole 13 can be made relatively short, and the air with respect to the axial center of the die body 5 It is possible to form the inclination angle of the ejection hole 13 with a steep inclination, and the effect of sucking the punched debris in the die hole 3 downward by the air ejected from the air ejection hole 13 can be more effectively performed. Is.

  By the way, as a structure of the said air ejection hole 13, it is desirable that it is the same diameter over the full length as a structure which is easy to process. However, it is also possible to make the outlet 13A of the air ejection hole 13 have a small diameter in order to increase the air injection speed into the discharge hole 7. That is, as shown in FIG. 8A, the air ejection hole 13 is formed into a tapered hole, or as shown in FIG. 8B, it is formed into a stepped hole having a small hole 13B on the tip side. It is also possible to do.

DESCRIPTION OF SYMBOLS 1 Die tool 3 Die hole 5 Die body 7 Discharge hole 9, 17 Inclined surface 13, 21 Air ejection hole 19 Through hole

Claims (1)

  A die tool having a discharge hole having a diameter larger than that of the die hole in a die body having a die hole at an upper portion, the die tool being an inner peripheral surface of the die body, which is below an intermediate height position of the die body. A drilling tool locking part is provided on the side, and a plurality of air ejection holes for ejecting air in the downward direction of the discharge hole are obliquely formed on the drilling tool locking part and An inlet is formed above an intermediate height position of the discharge hole, and an angle formed between the axis of the die body and the axis of each of the air ejection holes is an acute angle of 45 ° or less. Die tool to do.

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